Stereoscopic display device having a barrier panel

ABSTRACT

A stereoscopic display device including a barrier panel is provided. When a viewing distance of a viewer is out of the proper range, the stereoscopic display device may shift the blocking regions and the transmitting regions of the barrier panel. The stereoscopic display device may maintain the ratio of channels located within a barrier blocking region and a barrier transmitting region of the barrier panel by using the channels disposed within trigger regions of the barrier panel. Thus, the stereoscopic display device may provide a stereoscopic image of good quality to the viewer located at a region being out of the proper range.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the priority benefit of Korean PatentApplication No. 10-2017-0050033, filed Apr. 18, 2017, which is herebyincorporated by reference as if fully set forth herein.

BACKGROUND

Technical Field

The present disclosure relates to a stereoscopic display deviceincluding a barrier panel having blocking regions and transmittingregions.

Description of the Related Art

Generally, a display device includes a display panel for realizing animage. For example, the display module may include a liquid crystalpanel having a liquid crystal, and an OLED panel having an organiclight-emitting element.

The display device may realize a stereoscopic image using the positiondifference of two eyes. For example, a stereoscopic display devicerealizing the stereoscopic image may provide different images to theleft eye and the right eye of a viewer by using the difference of imagesdue to the position difference of the two eyes, that is, the binoculardisparity.

The stereoscopic display device includes an eyeglasses type using ashutter and a non-glasses type using a barrier panel. The barrier panelmay separate the image realized by the display panel, and provide it tothe viewer's left eye or right eye. For example, the barrier panel mayform a path difference of light by individually or region-by-regionadjusting voltage applied to the channels disposed at regular intervals.The barrier panel may include blocking regions and transmitting regionsformed by the applied voltage. The blocking regions are located betweenthe transmitting regions. For example, the barrier panel may include aliquid crystal disposed between a lower barrier substrate and an upperbarrier substrate.

In the stereoscopic display device, the location of the blocking regionsand the transmitting regions may be determined according to a setviewing distance. For example, when the viewing distance of the vieweris out of the proper range, the stereoscopic display device may move theblocking regions and the transmitting regions of the barrier panel forproviding a stereoscopic image of good quality to the viewer located ata region being out of the proper range.

However, in the stereoscopic display device, a size of some blockingregion or some transmitting region may be changed by movement of theblocking regions and the transmitting regions of the barrier panel. Theblocking region and the transmitting region having the changed size maybe recognized by the viewer as a bright line or a dark line. Thus, inthe stereoscopic display device, the quality of the image provided theviewer located at a region being out of the proper range may bedegraded.

BRIEF SUMMARY

Accordingly, the present disclosure is directed to a display device thatsubstantially obviates one or more problems due to limitations anddisadvantages of the related art.

An object of the present disclosure is to provide a stereoscopic displaydevice capable of providing a stereoscopic image of good quality to theviewer located at a region being out of the proper range.

Another object of the present disclosure is to provide a stereoscopicdisplay device in which a bright line and a dark line due to movement ofthe blocking regions and the transmitting regions of the barrier panelare prevented.

Additional advantages, objects, and features of the disclosure will beset forth in part in the description which follows and in part willbecome apparent to those having ordinary skill in the art uponexamination of the following or may be learned from practice of thedisclosure. The objectives and other advantages of the disclosure may berealized and attained by the structure particularly pointed out in thewritten description and claims hereof as well as the appended drawings.

To achieve these objects and other advantages and in accordance with thepurpose of the disclosure, as embodied and broadly described herein,there is provided a stereoscopic display device including a displaydriver driving a display panel. A barrier panel is located on thedisplay panel. The barrier panel includes a plurality of channels. Thechannels of the barrier panel are controlled by a barrier driver. Thebarrier panel includes barrier regions and trigger regions. The triggerregions are disposed between the barrier regions. A viewing distance ofa viewer is detected by a viewing distance detector. When the viewingdistance of the viewer is out of the proper range, a pair of the triggerregions symmetrical with respect to the center of the barrier panelincludes channels having intermediate gray value.

A size of each trigger region may be smaller than a size of each barrierregion.

Each of the barrier regions may include a barrier blocking region and abarrier transmitting region. The number of the channels within thebarrier blocking region may be same as the number of the channels withinthe barrier transmitting region.

The intermediate gray value may be a gray value between a gray value ofthe barrier blocking region and a gray value of the barrier transmittingregion.

The number of the channels within each trigger region may be a half ofthe number of the channels within each barrier region.

Each of the trigger regions may include a trigger blocking region and atrigger transmitting region. The number of the channels within thetrigger blocking region may be same as the number of the channels withinthe trigger transmitting region.

The trigger blocking region of each trigger region may be in contactwith the barrier blocking region of adjacent barrier region. The triggertransmitting region of each trigger region may be in contact with thebarrier transmitting region of adjacent barrier region.

The channel having the intermediate gray value may be disposed betweenthe trigger blocking region and the trigger transmitting region.

The trigger regions may be disposed side by side with the barrierregions.

The display panel may include a lower display substrate, a lowerlight-emitting electrode, a light-emitting layer, an upperlight-emitting electrode and an upper display substrate, which aresequentially stacked.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the disclosure and are incorporated in and constitute apart of this application, illustrate embodiment(s) of the disclosure andtogether with the description serve to explain the principle of thedisclosure. In the drawings:

FIG. 1 is a view schematically showing a stereoscopic display deviceaccording to an embodiment of the present disclosure;

FIG. 2A is a view showing a cross-section of a display panel and abarrier panel of the stereoscopic display device according to theembodiment of the present disclosure;

FIG. 2B is an enlarged view of region P in FIG. 2A;

FIG. 2C is an enlarged view of region R in FIG. 2A;

FIG. 3 is a view showing a surface of the barrier panel of thestereoscopic display device according to the embodiment of the presentdisclosure;

FIGS. 4A to 4D and 5A to 5D are views showing a gradation change of thechannels according to the viewing distance;

FIGS. 6 to 9 are views respectively showing a stereoscopic displaydevice according to another embodiment of the present disclosure.

DETAILED DESCRIPTION

Hereinafter, details related to the above objects, technicalconfigurations, and operational effects of the embodiments of thepresent disclosure will be clearly understood by the following detaileddescription with reference to the drawings, which illustrate someembodiments of the present disclosure. Here, the embodiments of thepresent disclosure are provided in order to allow the technical spiritof the present disclosure to be satisfactorily transferred to thoseskilled in the art, and thus the present disclosure may be embodied inother forms and is not limited to the embodiments described below.

In addition, the same or extremely similar elements may be designated bythe same reference numerals throughout the specification, and in thedrawings, the lengths and thickness of layers and regions may beexaggerated for convenience. It will be understood that, when a firstelement is referred to as being “on” a second element, although thefirst element may be disposed on the second element so as to come intocontact with the second element, a third element may be interposedbetween the first element and the second element.

Here, terms such as, for example, “first” and “second” may be used todistinguish any one element with another element. However, the naming ofan element as a first element or second element is done for clarity andthe convenience of those skilled in the art to identify particular partsand does not limit the disclosure or claims and does not depart from thetechnical spirit of the present disclosure.

The terms used in the specification of the present disclosure are merelyused in order to describe particular embodiments, and are not intendedto limit the scope of the present disclosure. For example, an elementdescribed in the singular form is intended to include a plurality ofelements unless the context clearly indicates otherwise. In addition, inthe specification of the present disclosure, it will be furtherunderstood that the terms “comprises” and “includes” specify thepresence of stated features, integers, steps, operations, elements,components, and/or combinations thereof, but do not preclude thepresence or addition of one or more other features, integers, steps,operations, elements, components, and/or combinations.

Unless otherwise defined, all terms (including technical and scientificterms) used herein have the same meaning as commonly understood by oneof ordinary skill in the art to which example embodiments belong. Itwill be further understood that terms, such as those defined in commonlyused dictionaries, should be interpreted as having a meaning that isconsistent with their meaning in the context of the relevant art andshould not be interpreted in an idealized or overly formal sense unlessexpressly so defined herein.

(Embodiment)

FIG. 1 is a view schematically showing a stereoscopic display deviceaccording to an embodiment of the present disclosure. FIG. 2A is a viewshowing a cross-section of a display panel and a barrier panel of thestereoscopic display device according to the embodiment of the presentdisclosure. FIG. 2B is an enlarged view of region P in FIG. 2A. FIG. 2Cis an enlarged view of region R in FIG. 2A.

Referring to FIGS. 1 and 2A to 2C, the stereoscopic display deviceaccording to the embodiment of the present disclosure may include adisplay panel 100, a barrier panel 200, a display driver 300, a timingcontroller 400, a viewing distance detector 500 and a barrier driver600.

The display panel 100 may realize an image provided to the viewer. Forexample, the display panel 100 may include a lower display substrate110, a light-emitting element 140 and an upper display substrate 180,which are sequentially stacked. The display panel 100 may realize theimage using the light generated by the light-emitting element 140. Forexample, the light-emitting element 140 may include a lowerlight-emitting electrode 141, a light-emitting layer 142 and an upperlight-emitting electrode 143, which are sequentially stacked. Thelight-emitting layer 142 may include an organic light-emitting materialor an inorganic light-emitting material. For example, the display panel100 of the stereoscopic display device according to the embodiment ofthe present disclosure may be an OLED panel including an organiclight-emitting element.

The display panel 100 may further include a thin film transistor 120between the lower display substrate 110 and the light-emitting element140, an interlayer insulating layer 130 covering the thin filmtransistor 120, and a bank insulating layer 150 covering an edge of thelower light-emitting electrode 141. The light-emitting element 140 maybe electrically connected to the interlayer insulating layer 130. Thelower light-emitting electrode 141 may be electrically connected to thethin film transistor 120. For example, the interlayer insulating layer130 may include a contact hole for connecting the lower light-emittingelectrode 141 to the thin film transistor 120.

The display panel 100 may further include an upper passivation layer 160between the light-emitting element 140 and the upper display substrate180, and an adhesive layer 170 between the upper passivation layer 160and the upper display substrate 180. The upper display substrate 180 maybe coupled to the lower display substrate in which the light-emittingelement 140 is formed by the adhesive layer 170. The upper passivationlayer 160 and the adhesive layer 170 may prevent a damage of thelight-emitting element 140 due to external impact. For example, theadhesive layer 170 may include a lower adhesive layer 171 and an upperadhesive layer 172. The upper adhesive layer 172 may be in directcontact with the lower adhesive layer 171 and the upper displaysubstrate 180. The adhesive layer 170 may prevent permeating theexternal moisture to the light-emitting element 140. For example, theupper adhesive layer 172 may include the moisture absorbing material 170b.

The barrier panel 200 may be disposed on the display panel 100. Thebarrier panel 200 may separate the image realized by the display panel100, and provide it to the viewer's left eye and right eye. For example,the image realized by the display panel 100 may be stereoscopicallyrecognized to the viewer by the barrier panel 200.

The barrier panel 200 may selectively transmit or block the light. Forexample, the barrier panel 200 may include a lower barrier substrate201, channels 202, a liquid crystal layer 204, a common electrode 205and an upper barrier substrate 206, which are sequentially stacked. Theliquid crystal layer 204 may include TN mode or ECB mode liquid crystal.The channels 202 may have a multi-layer structure insulated by aninsulating layer 203.

The stereoscopic display device according to the embodiment of thepresent disclosure may further comprise a front linear polarizer 710disposed between the display panel 100 and the barrier panel 200, and arear linear polarizer 720 located on an outer surface of the barrierpanel 200. The rear linear polarizer 720 may include a transmission axisorthogonal with the front linear polarizer 710. The rear linearpolarizer 720 may be in direct contact with the barrier panel 200.

The barrier panel 200 may transmit or block the light according to thevoltage applied to the channel 202. For example, the stereoscopicdisplay device according to the embodiment of the present disclosure maybe a normally white mode in which the liquid crystal layer 204 locatedon the voltage-applied channel 202 is driven to block the light.

As shown in FIG. 3, the barrier panel 200 may include barrier regions210 and trigger regions 220. The trigger regions 220 may be disposedbetween the barrier regions 210. The trigger regions 220 may be locatedside-by-side with the barrier regions 210. For example, the triggerregions 220 may be disposed symmetrically with respect to the center ofthe barrier panel 200. The barrier regions 210 and the trigger regions220 may be extended in a vertical direction.

A size of each trigger region 220 may be smaller than a size of eachbarrier region 210. The trigger regions 220 may have the same size. Thebarrier regions 210 may have the same size. For example, a width W1 ofeach barrier region 210 may be larger than a width W2 of each triggerregion 220.

The display driver 300 may drive the display panel 100. The displaypanel 100 may receive signals for realizing the image from the displaydriver 300. For example, the display driver 300 may include a datadriver 310 and a scan driver 320.

The data driver 310 may supply data signals to the display panel 100.The scan driver 320 may sequentially apply scan signals to the displaypanel 100. The data signals supplied by the data driver 310 may besynchronized with the scan signals applied by the scan driver 320.

The timing controller 400 may provide signal necessary for the operationof the display driver 300. For example, the timing controller 400 mayprovide a digital video data and a source timing controlling signal tothe data driver 310. The scan driver 320 may receive a clock signal, areset clock signal and a start signal from the timing controller 400.

The viewing distance detector 500 may sense a viewing distance of aviewer. For example, the viewing distance detector 500 may detectlocation information of the viewer viewing the image realized by thedisplay panel 100 and the barrier panel 200. The viewing distancedetector 500 may include a camera. In one example, the camera may have arange finder circuit and sensor of a type known in the art to detect anddetermine the exact range of people's faces from the camera and thusalso the distance from the display. In another example, the viewingdistance detector 500 may work with a remote control that is controllingthe program being viewed on the display. When the remote control is usedto change the channel, the display can determine the exact distancebetween the remote control and display using known signal transmissiontechnology. Since the user has just changed the program to a newprogram, In this example, the user will be expected to be holding theremote control and this will provide information of the distance theuser is from the display. Other techniques might be used to determinethe distance of the user, and in particular, the users face, from thedisplay to determine the that distance.

FIGS. 4A to 4D are views respectively showing a cross-section takenalong I-I′ of FIG. 3. Also, each of FIGS. 4A to 4D shows a gradationchange of the channels located within the barrier regions 210 and thetrigger regions 220 of the barrier panel, when the viewer movesgradually closer to the display panel 100 from a region having a viewingdistance of the proper range. The cross-section I-I′ is taken along justone side of the display and a corresponding change will be made in thebarrier panel at a symmetrical location on the other side of thedisplay, thus, a pair of grey areas will per present, one on each sideof the barrier panel, even though only one side of the barrier is shownin FIGS. 4A-4D and 5A-5D.

Referring FIGS. 4A to 4D, it will describe that the gradation of thechannels are changed according to the location of the viewer. First,when the viewer is located within a region having a viewing distance ofthe proper range, as shown in FIG. 4A, the barrier region 210 and thetrigger regions 220 may have a transmitting region 211 and 221, and ablocking region 212 and 222, respectively.

Each of the barrier regions 210 may include a barrier transmittingregion 211 and a barrier blocking region 212. The number of the channelswithin the barrier transmitting region 211 may be same as the number ofthe channels within the barrier blocking region 212 of the correspondingbarrier region 210. For example, the barrier transmitting region 211 andthe barrier blocking region 212 may have eight channels, respectively.Each of the barrier regions 210 may include 16 channels.

The location of the barrier transmitting region 211 and the barrierblocking region 212 may be reversed in adjacent barrier regions 210. Ineach of barrier regions 210, the channels consisting of the barriertransmitting region 211 or the channels consisting of the barrierblocking region 212 may be not continuous. Each of the barrier regions210 may include the barrier transmitting region 211 located between thechannels consisting of the barrier blocking region 212 and the barrierblocking region 212 located between the channels consisting of thebarrier transmitting region 211. For example, each of the barrierregions 210 may include four channels for configuring the barrierblocking region 212 on both sides of the barrier transmitting region211, or four channels for configuring the barrier transmitting region211 on both sides of the barrier blocking region 212. The barrierregions 210 including the barrier transmitting region 211 between thechannels consisting of the barrier blocking region 212 and the barrierregions 210 including the barrier blocking region 212 between thechannels consisting of the barrier transmitting region 211 may berepeated.

Each of the trigger regions 220 may include a trigger transmittingregion 221 and a trigger blocking region 222. The number of the channelswithin the trigger transmitting region 221 may be same as the number ofthe channel blocking region 222 of the corresponding trigger region 220.The number of the channels within each trigger region 220 may be smallerthan the number of the channels within each barrier region 210. Thenumber of the channels within the trigger region 220 may be a half ofthe number of the channels within the barrier region 210. For example,the trigger transmitting region 221 and the trigger blocking region 222may have four channels, respectively.

The trigger transmitting region 221 of each trigger region 220 may be indirect contact with the barrier transmitting region 211 of adjacentbarrier region 210. The gray value of the trigger transmitting region221 may be same as the gray value of the barrier transmitting region211. The barrier transmitting region 211 and the trigger transmittingregion 221 adjacent to the barrier transmitting region 211 may consistof the transmitting region 211 and 221 of the barrier panel 200. Thetrigger blocking region 222 of each trigger region 220 may be in directcontact with the barrier blocking region 212 of adjacent barrier region210. The gray value of the trigger blocking region 222 may be same asthe gray value of the barrier blocking region 212. The trigger blockingregion 222 and the barrier blocking region 212 adjacent to the triggerblocking region 222 may consist of the blocking region 212 and 222 ofthe barrier panel 200. Thus, in the barrier panel 200 of thestereoscopic display device according to the embodiment of the presentdisclosure, transmitting regions 211 and 221, and blocking regions 212and 222 are regularly repeated, when the viewer is located within aregion having the viewing distance of the proper range.

When the viewer is located closer than the region having the viewingdistance of the proper range, the trigger region 220 farthest from thecenter of the barrier panel 200 may include a channel 223 havingintermediate gray value, as shown in FIG. 4B.

In the trigger region 220 farthest from the center of the barrier panel200, the number of the channels consisting of the trigger blockingregion 222 may be smaller than the number of the channels consisting ofthe trigger transmitting region 221. For example, the trigger region 220farthest from the center of the barrier panel 200 may include thetrigger transmitting region 221 having three channels and the triggerblocking region 222 having four channels. Thus, in the stereoscopicdisplay device according to the embodiment of the present disclosure,the transmitting region 211 and 221 farthest the center of the barrierpanel may move toward the outside of the barrier panel, when thelocation of the viewer is closer than the region having the viewingdistance of the proper range. When the transmitting region 211 and 221of the barrier panel moves toward the outside of the barrier panel, thefocus of the stereoscopic image provided to the viewer may be broughtcloser to the display panel. Therefore, in the stereoscopic displaydevice according to the embodiment of the present disclosure, thetransmitting region 211 and 221 of the barrier panel may move toward theoutside of the barrier panel by locating some channel 223 having theintermediate gray value within the trigger region 220, so that thestereoscopic image of good quality may provide to the viewer being afirst close distance that is closer than the region having the viewingdistance of the proper range.

The channel 223 having the intermediate gray value is disposed betweenthe trigger transmitting region 221 and the trigger blocking region 222in the corresponding trigger region 220. Thus, in the stereoscopicdisplay device according to the embodiment of the present disclosure, aboundary between the trigger transmitting region 221 and the triggerblocking region 222 having different numbers of the channels, forexample a boundary between the trigger transmitting region 221 havingthree channels and the trigger blocking region 222 having four channels,may be blurredly recognized to the viewer. Thus, in the stereoscopicdisplay device according to the embodiment of the present disclosure, itcan be prevented that the change size of the transmitting region 211 and221, or the blocking region 212 and 222 which are located adjacent, isrecognized by the viewer closer than the region having the viewingdistance of the proper range as a bright line or a dark line.

The stereoscopic display device according to the embodiment of thepresent disclosure only describes the trigger region 220 near the oneside of the barrier panel. However, the trigger regions 220 positionedto be symmetrical with respect to the center of the barrier panel may becontrolled in the same manner, substantially. For example, in thestereoscopic display device according to the embodiment of the presentdisclosure, when the viewer is located closer than the region having theviewing distance of the proper range, a pair of trigger regions 220farthest from the center of the barrier panel may respectively includethe channel 223 having the intermediate gray value, so that a pair oftransmitting regions 211 and 221 farthest from the center of the barrierpanel may move toward the corresponding outside of the barrier panel.

When the location of the viewer is at a second close distance, evencloser than the first close distance and much closer than region havingthe viewing distance of the proper range, the trigger region 220farthest from the center of the barrier panel and the trigger region 220secondly far from the center of the barrier panel may include a channel223 having the intermediate gray value, as shown in FIG. 4C.

The barrier transmitting region 211 of the barrier region 210 betweentwo the trigger regions 220 including the channel 223 having theintermediate gray value, may move toward the outside of the barrierpanel. That is, the barrier region 220 between two trigger regions 220including the channel 223 having the intermediate gray value, mayinclude the barrier transmitting region 221 having eight channelsbetween the barrier blocking region 212 having three channels and thebarrier blocking region 212 having five channels. Thus, in thestereoscopic display device according to the embodiment of the presentdisclosure, the transmitting region 211 and 221 farthest from the centerof the barrier panel may move further the outside of the barrier panel.Thereby, in the stereoscopic display device according to the embodimentof the present disclosure, the focus of the stereoscopic image may befurther brought closer to the display panel.

As shown in FIG. 4D, when the viewer is located even closer from theregion having the viewing distance of the proper range, for example, ata third close distance. The second close distance is thus closer to thedisplay than the first close distance and the third close distance iscloser to the display than the second close distance. The trigger region220 farthest from the center of the barrier panel, the trigger region220 secondly far from the center of the barrier panel, and the triggerregion 220 third far from the center of the barrier panel may include achannel 223 having the intermediate gray value. Thus, in thestereoscopic display device according to the embodiment of the presentdisclosure, the focus of the stereoscopic image may be brought evencloser to the display panel by further moving the transmitting region211 and 221 farthest from the center of the barrier panel toward theoutside of the barrier panel.

FIGS. 5A to 5D are views respectively showing a cross-section takenalong I-I′ of FIG. 3. Also, each of FIGS. 5A to 5D shows a gradationchange of the channels located within the barrier regions 210 and thetrigger regions 220 of the barrier panel, when the viewer is graduallymoving away from the region having the viewing distance of the properrange.

Referring FIGS. 5A to 5D, it will describe the gray value of thechannels within the barrier regions 210 and the trigger regions 220,when the viewer moves away from the region having the viewing distanceof the proper range. First, when the viewer is located within a regionhaving a viewing distance of the proper range, the barrier panel mayinclude transmitting regions 211 and 221, and blocking regions 212 and222, as shown in FIG. 5A.

As shown in FIG. 5B, when the viewer moves further away from the regionhaving the viewing distance of the proper range to a first far distance,the trigger region 220 farthest from the center of the barrier panel mayinclude the channel 223 having the intermediate gray value,

In the trigger region 220 farthest from the center of the barrier panel,the number of the channels consisting of the trigger transmitting region221 may be larger than the number of the channels consisting of thetrigger blocking region 222. For example, the trigger region 220farthest from the center of the barrier panel may include the triggertransmitting region 221 having four channels and the trigger blockingregion 222 having three channels. Thus, in the stereoscopic displaydevice according to the embodiment of the present disclosure, thetransmitting region 211 and 221 farthest from the center of the barrierpanel may move toward the center of the barrier panel, when the viewermoves away from the region having the viewing distance of the properrange. Therefore, in the stereoscopic display device according to theembodiment of the present disclosure, the transmitting regions 211 and221 of the barrier panel may move toward the center of the barrier panelby locating the channel 223 having the intermediate gray value withinthe trigger region 220, so that the stereoscopic image of good qualitymay provide to the viewer moving away from the region having the viewingdistance of the proper range.

As shown in FIG. 5C, when the location of the viewer is even furtheraway from the region having the viewing distance of the proper range ata second far distance, the trigger region 220 farthest from the centerof the barrier panel and the trigger region 220 secondly far from thecenter of the barrier panel may include the channel 223 having theintermediate gray value. Thus, in the stereoscopic display deviceaccording to the embodiment of the present disclosure, the triggerregion 220 farthest from the center of the barrier panel, and thebarrier transmitting region 211 of the barrier panel 210 disposedbetween two trigger region 220 including the channel 223 having theintermediate gray value, may move toward the center of the barrierpanel. Therefore, in the stereoscopic display device according to theembodiment of the present disclosure, the focus of the stereoscopicimage may further move away from the display panel.

As shown in FIG. 5D, when the location of the viewer is still furtheraway from the region having the viewing distance of the proper range ata third far distance, the trigger region 220 farthest from the center ofthe barrier panel, the trigger region 220 secondly far from the centerof the barrier panel and the trigger region 220 third far from thecenter of the barrier panel may include the channel 223 having theintermediate gray value. Thus, in the stereoscopic display deviceaccording to the embodiment of the present disclosure, the focus of thestereoscopic image may further mover away from the display panel byfurther moving the transmitting regions 211 and 221 of the barrier paneltoward the center of the barrier panel.

The stereoscopic display device according to the embodiment of thepresent disclosure is described that the channel 223 having theintermediate gray value is preferentially located within the triggerregion 220 farthest from the center of the barrier panel, when thelocation of the viewer is out of the region having the viewing distanceof the proper range. However, in the stereoscopic display deviceaccording to another embodiment of the present disclosure, the triggerregion 220 closest to the center of the barrier panel includespreferentially the channel 223 having the intermediate gray value, sothat a stereoscopic image of good quality is provided to the viewerlocated at a region being out of the proper range.

Accordingly, in the stereoscopic display device according to theembodiment of the present disclosure, a pair of the trigger regions 220symmetrical with respect to the center of the barrier panel may includethe channel 223 having the intermediate gray value according to thelocation of the viewer located at the region being out of the properrange, so that the size ratio between the trigger transmitting region221 and the trigger blocking region 222 of the corresponding triggerregion 220 may be adjusted, and the transmitting region 211 and 221 ofthe barrier panel may be moved. Thus, in the stereoscopic display deviceaccording to the embodiment of the present disclosure, the stereoscopicimage of good quality may be provided to the viewer located at theregion being out of the proper range. Also, in the stereoscopic displaydevice according to the embodiment of the present disclosure, thechannel 223 having the intermediate gray value may be disposed betweenthe trigger transmitting region 221 and the trigger blocking region 222of the corresponding trigger region 220, so that the signal applied tothe channel having the intermediate gray value may not affect thechannels within the barrier transmitting region 211 and the barrierblocking region 212 of adjacent barrier region 210. Thereby, in thestereoscopic display device according to the embodiment of the presentdisclosure, the stereoscopic image of good quality may be provided tothe viewer located at the region being out of the proper range withoutaffecting the gradation of the channel within the barrier region 210.

The stereoscopic display device according to the embodiment of thepresent disclosure may further comprise a structure for preventingreflection of external light. For example, the stereoscopic displaydevice according to the embodiment of the present disclosure may furtherinclude a quarter-wave plate 800 between the display panel 100 and thefront linear polarizer 710, as shown in FIG. 2A. The quarter-wave plate800 may be in direct contact with the display panel 100 and the frontlinear polarizer 710.

The stereoscopic display device according to the embodiment of thepresent disclosure is described that the width of the trigger regions220 is a half of the width of the barrier regions 210. However, thestereoscopic display device according to another embodiment of thepresent disclosure may include the barrier panel 200 in which the widthof the barrier regions 210 is at least twice the width of the triggerregions 220, as shown in FIG. 6. For example, in the stereoscopicdisplay device according to another embodiment of the presentdisclosure, the trigger regions 220 having eight channels may bedisposed between the barrier regions 210 having at least 17 channels.Thus, in the stereoscopic display device according to another embodimentof the present disclosure, the focus of the stereoscopic image providedto the viewer may be finely adjusted according to the distance betweenthe location of the viewer and the region being out of the proper range.

The stereoscopic display device according to the embodiment of thepresent disclosure is described that the barrier regions 210 have thesame width. However, in the stereoscopic display device according toanother embodiment of the present disclosure, the width of the barrierregions 210 may be reduced toward the outside of the barrier panel 200,as shown in FIG. 7. Thus, in the stereoscopic display device accordingto another embodiment of the present disclosure, the focus of thestereoscopic image provided to the viewer may be efficiently adjustedaccording to the location variation of the viewer.

The stereoscopic display device according to the embodiment of thepresent disclosure is described that the barrier panel 200 is located onthe display panel 100 including the light-emitting element 140. However,the stereoscopic display device according to another embodiment of thepresent disclosure may include the barrier panel 200 between the displaypanel 100 and the light-emitting element 900, as shown in FIG. 8. Forexample, the display panel 100 of the stereoscopic display deviceaccording to another embodiment of the present disclosure may be theliquid crystal panel. The light-emitting element 900 may serve as aback-light unit. The front linear polarizer 710 and the rear linearpolarizer 720 may be in direct contact with the barrier panel 200. Animage linear polarizer 730 may be disposed on the outer surface of thedisplay panel 100. Thus, in the stereoscopic display device according toanother embodiment of the present disclosure, the stereoscopic image ofgood quality may be provided to the viewer located at the region beingout of the proper range without the relative location of the displaypanel 100 and the barrier panel 200.

The stereoscopic display device according to another embodiment of thepresent disclosure is described that the barrier panel 200 is locatedbetween the light-emitting element 900 and the display panel 100.However, the stereoscopic display device according to further anotherembodiment of the present disclosure may include the display panel 100between the light-emitting element 900 and the barrier panel 200, asshown in FIG. 9. An image linear polarizer 740 may be disposed betweenthe light-emitting element 900 and the display panel 100. The imagelinear polarizer 730 and the front linear polarizer 710 may be in directcontact with the display panel 100. Thus, in the stereoscopic displaydevice according to another embodiment of the present disclosure, thestereoscopic image of good quality may be provided to the viewer locatedat the region being out of the proper range in the display panel 100 andthe barrier panel 200 at various positions.

In the result, the stereoscopic display device according to anotherembodiment of the present disclosure may prevent the generation ofbright line and dark line due to the blocking regions and thetransmitting regions of the barrier panel which are moved according tothe viewing distance change by using the channels within the triggerregions. Thus, in the stereoscopic display device according to anotherembodiment of the present disclosure, the stereoscopic image of goodquality may be provided to the viewer located at the region being out ofthe proper range. Thereby, in the stereoscopic display device accordingto another embodiment of the present disclosure, the region viewing thestereoscopic image may be increased without degrading the quality of thestereoscopic image.

The various embodiments described above can be combined to providefurther embodiments. All of the U.S. patents, U.S. patent applicationpublications, U.S. patent applications, foreign patents, foreign patentapplications and non-patent publications referred to in thisspecification and/or listed in the Application Data Sheet areincorporated herein by reference, in their entirety. Aspects of theembodiments can be modified, if necessary to employ concepts of thevarious patents, applications and publications to provide yet furtherembodiments.

These and other changes can be made to the embodiments in light of theabove-detailed description. In general, in the following claims, theterms used should not be construed to limit the claims to the specificembodiments disclosed in the specification and the claims, but should beconstrued to include all possible embodiments along with the full scopeof equivalents to which such claims are entitled. Accordingly, theclaims are not limited by the disclosure.

The invention claimed is:
 1. A stereoscopic display device, comprising:a display driver driving a display panel; a barrier panel on the displaypanel, the barrier panel including a plurality of channels; a barrierdriver controlling the channels of the barrier panel; and a viewingdistance detector detecting a viewing distance of a viewer, wherein thebarrier panel includes barrier regions and trigger regions between thebarrier regions, each of the barrier regions includes a barrier blockingregion and a barrier transmitting region having the same size as thebarrier blocking region, each of the trigger regions includes a triggerblocking region and a trigger transmitting region, and wherein a pair ofthe trigger regions symmetrical with respect to a center of the barrierpanel includes channels having intermediate gray value between thetrigger blocking region and the trigger transmitting region, when theviewing distance is out of the initial proper range.
 2. The stereoscopicdisplay device according to claim 1, wherein a size of each triggerregion is smaller than a size of each barrier region.
 3. Thestereoscopic display device according to claim 1, wherein the number ofthe channels within the barrier blocking region is same as the number ofthe channels within the barrier transmitting region.
 4. The stereoscopicdisplay device according to claim 3, wherein the intermediate gray valueis a gray value between a gray value of the barrier blocking region anda gray value of the barrier transmitting region.
 5. The stereoscopicdisplay device according to claim 3, wherein the number of the channelswithin each trigger region is a half of the number of the channelswithin each barrier region.
 6. The stereoscopic display device accordingto claim 3, wherein the number of the channels within the triggerblocking region is different from the number of the channels within thetrigger transmitting region.
 7. The stereoscopic display deviceaccording to claim 6, wherein the trigger blocking region of eachtrigger region is in contact with the barrier blocking region ofadjacent barrier region, and the trigger transmitting region of eachtrigger region is in contact with the barrier transmitting region ofadjacent barrier region.
 8. The stereoscopic display device according toclaim 6, wherein the blocking region constituted of the barrier blockingregion and the trigger blocking region, and the transmitting regionconstituted of the barrier transmitting region and the triggertransmitting region has a constant size.
 9. The stereoscopic displaydevice according to claim 1, wherein the trigger regions are disposedside by side with the barrier regions.
 10. The stereoscopic displaydevice according to claim 1, wherein the display panel includes a lowerdisplay substrate, a lower light-emitting electrode, a light-emittinglayer, an upper light-emitting electrode and an upper display substrate,which are sequentially stacked.
 11. The stereoscopic display deviceaccording to claim 10, wherein the number of channels within the triggerblocking region is different from the number of the channels within thetrigger transmitting region when the viewer is the initial properdistance from the display.
 12. The stereoscopic display device accordingto claim 10, wherein the number of channels within a pair of triggerblocking regions located at a symmetrical distance with respect to thecenter of the display is greater than the number of the channels withinthe trigger transmitting region when the viewer is the first closedistance away from the display.
 13. The stereoscopic display deviceaccording to claim 10, wherein the number of the channels within a firstpair of trigger blocking regions located at a symmetrical distance withrespect to the center of the display is twice as great as the number ofthe channels within the trigger transmitting region when the viewer isthe second close distance away from the display, closer than the firstdistance, and the number of the channels within a second pair of triggerblocking regions located at a symmetrical distance with respect to thecenter of the display is greater than the number of the channels withinthe trigger transmitting region when the viewer is the second closedistance away from the display, wherein the second pair of triggerregions is closer to the center of the display than the first pair oftrigger regions.
 14. The stereoscopic display device according to claim10, wherein the number of the channels within a pair of trigger blockingregions located at a symmetrical distance with respect to the center ofthe display is less than the number of the channels within the triggertransmitting region when the viewer is the first far distance away fromthe display.
 15. The stereoscopic display device according to claim 10,wherein the number of the channels within a first pair of triggerblocking regions located at a symmetrical distance with respect to thecenter of the display is less than half the number of the channelswithin the trigger transmitting region when the viewer is the second,far distance away from the display, farther than the first far distance,and the number of the channels within a second pair of trigger blockingregions located at a symmetrical distance with respect to the center ofthe display is less than the number of the channels within the triggertransmitting region when the viewer is the second close distance awayfrom the display, wherein the second pair of trigger regions is closerto the center of the display than the first pair of trigger regions. 16.A method of operating a stereoscopic display device, comprising: drivinga display panel with a display driver circuit to output a video image;passing the video image through a barrier panel on the display panel,the barrier panel including a plurality of channels, the barrier panelincluding barrier regions and trigger regions between the barrierregions, each of the barrier regions includes a barrier blocking regionand a barrier transmitting region having the same size as the barrierblocking region, each of the trigger regions includes a trigger blockingregion and a trigger transmitting region; controlling the channels ofthe barrier panel with a barrier driver circuit; and detecting a viewingdistance of a viewer watching the video; and placing at least onechannel having an intermediate gray value when the viewing distance isout of the initial proper range in a pair of the trigger regions locatedsymmetrical with respect to a center of the barrier panel, wherein thechannel having intermediate gray value is disposed between the triggerblocking region and the trigger transmitting region.
 17. The method ofclaim 16 further comprising: sensing that the viewer is a first, closedistance from the display; placing only a single pair of channels havingan intermediate gray value when the viewing distance is at the firstclose distance that is out of the initial proper range for viewing, eachchannel in the pair being in trigger regions located symmetrical withrespect to a center of the barrier panel.
 18. The method of claim 17further comprising: sensing that the viewer is a second, close distancefrom the display, the second close distance being closer than the firstclose distance; placing at least two pairs of channels having anintermediate gray value when the viewing distance is at the second closedistance that is out of the initial proper range for viewing, eachchannel in each pair being in trigger regions located symmetrical withrespect to a center of the barrier panel.
 19. The method of claim 18further comprising: sensing that the viewer is a third, close distancefrom the display, the third close distance being closer than the secondclose distance; placing at least three pairs of channels having anintermediate gray value when the viewing distance is at the third closedistance that is out of the initial proper range for viewing, eachchannel in each pair being in trigger regions located symmetrical withrespect to a center of the barrier panel.
 20. The method of claim 19wherein each channel of the first pair of the three pairs is located afirst, far distance from the center of the barrier panel, adjacent to anedge of the panel, at a symmetrical location with respect to each other;each channel of the second pair of the three pairs is located a seconddistance from the center of the barrier panel, closer than the first fardistance, at a symmetrical location with respect to each other; and eachchannel of the third pair of the three pairs is located a third distancefrom the center of the barrier panel, closer than the second distance,at a symmetrical location with respect to each other.